孢粉记录揭示的2万年以来若尔盖地区的气候变化  

The Vegetation and Climatic Changes in Zoige During the Last 20 000 years Determined by Pollen Records

作　　者：刘光锈[1] 沈永平[1] 王睿[1] 王苏民[1] 

机构地区：[1]中国科学院兰州冰川冻土研究所,中国科学院南京地理与湖泊研究所

出　　处：《冰川冻土》1995年第2期132-137,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金

摘　　要：若尔盖黑河牧场ＤＣ剖面的孢粉记录表明，末次冰期晚阶段若尔盖高原的气候表现为不稳定性，即冷暖变化频繁，其基本变化与全球一致。相对暖的阶段发生在２０－１８ｋａＢＰ，１６－１５ｋａＢＰ和１３－１１．２ｋａＢＰ；相对冷的阶段在１８－１６ｋａＢＰ，１５－１４ｋａＢＰ和１１．２－１０．２ｋａＢＰ。其中末次冰期最盛期发生于１８－１６ｋａＢＰ，１１．２－１０．２ｋａＢＰ的降温可对应于ＹｏｕｎｇｅｒＤｒｙａｓ事件。１０．２ｋａＢＰ开始，气温回升，全新世来临。９－３ｋａＢＰ为全新世大暖期，其中，７ｋａＢＰ左右达鼎盛期；６－５ｋａＢＰ间有一次冷的波动。The pollen records from Zoige, located in the northeastern Tibetan Plateau, indicate that the climate in this area was unstable during the last 20000 years. The relative warm periods took place about 20-18, 16-15, 13-12, 11-6, 5-3kaBP, the cold ones occured about 18-16, 15-14, 12-11 and 6-5kaBP. Last Glacial Maximum was about 18-16kaBP. The cold event of 12-11kaBP could correspond with Younger Dryas. From 11kaBP the forest vegetation was developing, which represented the coming of Holocene.During 9-3kaBP, the coniferous and deciduous broadleaf forest showed the Holocene Megathermal and reached the maximum about 7-6kaBP as Rhus and Castanea presented inthe forest. About 6-5kaBP absence of pollen might reflect a cole climate in Holocene.

关 键 词：孢粉记录 若尔盖地区 气候变化 

分 类 号：P467[天文地球—大气科学及气象学]